The Rutans shape shifting ability must stand them in good stead. Maybe they created the coronic acid that is used against the Sontarans in The Two Doctors.

The only time that the two races appeared together (that I know of) was in a low budget film by Reeltime called 'Shakedown'. From that, it seems the Rurans have the edge. Funnily enough, Brian Croucher was in that playing a space millionaire!! _________________Everything in life is only for now.